Define "middle-aged"

It appears I have offended Ellen. In my profile, you might have noticed that I describe myself as "middle-aged." I'm 35, and Ellen is a few months older than me. She has stated that 35 is clearly not "middle aged." Well, maybe I'm off in my logic, but if you know... you kick off at age 70, then 35 is middle aged. Ok, I'll admit, I hope to live into my late 80's and maybe my 90's... goddess willing my health is good until those decades. So, yeah, I see middle aged as being a span that starts at aged 35 and extends until age 50. Any thoughts out there on this topic??

~m